Florida's threatened Everglades National Park

CaptionEverglades National Park, Fla.

Joe Raedle / Getty Images

The Everglades National Park is on UNESCO's List of World Heritage in Danger. Here, visitors return to the park after it was closed to visitors for 16 days during a partial government shutdown in October.

The Everglades National Park is on UNESCO's List of World Heritage in Danger. Here, visitors return to the park after it was closed to visitors for 16 days during a partial government shutdown in October. (Joe Raedle / Getty Images)